package com.bwie.filter;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.concurrent.TimeUnit;

@Configuration
@Order(1)
public class MyGlobalFilter implements GlobalFilter {

    @Autowired
    StringRedisTemplate redisTemplate;

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        //获取参数
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String url = request.getURI().getPath();
        System.out.println("请求路径:"+url);

        //白名单
        if (url.contains("/login") || url.contains("/sendCode/")){
            System.out.println("登录白名单:"+url);
            return chain.filter(exchange);
        }



        //校验token
        String token = request.getHeaders().getFirst("token");
        if (token==null){
            System.out.println("token为空:"+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        Claims body = Jwts.parser().setSigningKey("123456").parseClaimsJws(token).getBody();
        Integer userId = body.get("userId", Integer.class);


        String rediskey="token-"+userId;
        String redisToken = redisTemplate.opsForValue().get(rediskey);
        if (redisToken==null){
            System.out.println("token过期:"+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        if (!token.equals(redisToken)){
            System.out.println("token错误:"+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        redisTemplate.expire(rediskey,15, TimeUnit.MINUTES);

        System.out.println("放行:"+url);


        return chain.filter(exchange);
    }
}
